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Finding the Fourth Proportional to 679.52, 1,019.36 and 639.04

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Solution

The fourth proportional to 679.52, 1,019.36 and 639.04 is: 958.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.52 : 1,019.36 = 639.04 : x
  2. Step 2: Convert to fraction form
    679.52/1,019.36 = 639.04/x
  3. Step 3: Cross multiply
    679.52x = 1,019.36 × 639.04
  4. Step 4: Simplify right side
    679.52x = 651,411.81
  5. Step 5: Solve for x
    x = 651,411.81/679.52
  6. Step 6: Final answer
    x = 958.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.